U.S. patent application number 15/699162 was filed with the patent office on 2018-03-22 for display device and driving method thereof.
The applicant listed for this patent is SAMSUNG DISPLAY CO., LTD.. Invention is credited to Sung Hoon BANG, Oh Jo KWON, Jeong Hwan SHIN, Sang Jae YEO.
Application Number | 20180082639 15/699162 |
Document ID | / |
Family ID | 59955487 |
Filed Date | 2018-03-22 |
United States Patent
Application |
20180082639 |
Kind Code |
A1 |
SHIN; Jeong Hwan ; et
al. |
March 22, 2018 |
DISPLAY DEVICE AND DRIVING METHOD THEREOF
Abstract
A display device includes pixels connected to data lines and
scan lines, a first compensator which is connected to sensing lines
and senses deviation information of the sensing lines while
supplying different voltages to adjacent sensing lines, and a
sensing unit which is connected to the first compensator and senses
characteristic information of each of the pixels.
Inventors: |
SHIN; Jeong Hwan;
(Yongin-si, KR) ; BANG; Sung Hoon; (Yongin-si,
KR) ; YEO; Sang Jae; (Yongin-si, KR) ; KWON;
Oh Jo; (Yongin-si, KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
SAMSUNG DISPLAY CO., LTD. |
Yongin-si |
|
KR |
|
|
Family ID: |
59955487 |
Appl. No.: |
15/699162 |
Filed: |
September 8, 2017 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
G09G 2310/08 20130101;
G09G 2320/043 20130101; G09G 2320/0693 20130101; G09G 3/3216
20130101; G09G 2320/045 20130101; G09G 3/3275 20130101; G09G
2330/021 20130101; G09G 2320/0223 20130101; G09G 3/3258 20130101;
G09G 3/3266 20130101; G09G 2300/0819 20130101; G09G 2320/0295
20130101; G09G 3/3225 20130101; G09G 3/3225 20130101; G09G
2320/0295 20130101; G09G 2320/0295 20130101 |
International
Class: |
G09G 3/3258 20060101
G09G003/3258; G09G 3/3266 20060101 G09G003/3266; G09G 3/3275
20060101 G09G003/3275 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 22, 2016 |
KR |
10-2016-0121321 |
Claims
1. A display device, comprising: pixels connected to data lines and
scan lines; a first compensator which is connected to sensing lines
and senses deviation information of the sensing lines while
supplying different voltages to adjacent sensing lines of the
sensing lines; and a sensing unit which is connected to the first
compensator and senses characteristic information of each of the
pixels.
2. The display device of claim 1, wherein the first compensator
supplies a first voltage to a first capacitor provided in a
predetermined sensing line of the adjacent sensing lines and
supplies a second voltage different from the first voltage to a
second capacitor provided in an adjacent sensing line of the
adjacent sensing lines.
3. The display device of claim 2, wherein the sensing unit
generates first channel data in a digital form by a voltage stored
in the first capacitor and generates second channel data in a
digital form by a voltage stored in the second capacitor.
4. The display device of claim 3, wherein the sensing unit
generates charge data in a digital form by a charge share voltage
generated by charge-sharing the first capacitor and the second
capacitor.
5. The display device of claim 4, further comprising a timing
controller which obtains a ratio of the first capacitor to the
second capacitor by the first channel data, the second channel
data, and the charge data, wherein the ratio of the first capacitor
to the second capacitor is the deviation information.
6. The display device of claim 1, wherein the first compensator
includes a multiplexer connected to the sensing lines and a switch
unit connected between the multiplexer and the sensing unit.
7. The display device of claim 6, wherein the switch unit includes
a first switch connected between the multiplexer and a first node,
a second switch connected between the multiplexer and the first
node, a third switch connected between the first node and a
reference power supply, and a fourth switch connected between the
first node and the sensing unit.
8. The display device of claim 7, wherein the multiplexer
sequentially connects the first switch to a first sensing line to
an (m-1)th sensing line of the sensing lines where m is a natural
number greater than two, and sequentially connects the second
switch to a second sensing line to an mth sensing line of the
sensing lines.
9. The display device of claim 7, wherein the third switch is
turned on to supply a first voltage of the reference power supply
to a predetermined sensing line of the adjacent sensing lines
connected to the first switch during at least a portion of a period
in which the first switch is turned on, and the third switch is
turned on to supply a second voltage of the reference power supply
to an adjacent sensing line of the adjacent sensing lines connected
to the second switch during at least a portion of a period in which
the second switch is turned on.
10. The display device of claim 9, wherein the first voltage and
the second voltage are set to be different from each other.
11. The display device of claim 9, wherein the first voltage is set
to be higher than the second voltage.
12. The display device of claim 9, wherein after the first voltage
is stored in a first capacitor equivalently provided in the
predetermined sensing line, and the second voltage is stored in a
second capacitor equivalently provided in the adjacent sensing
line, the first switch and the second switch are turned on, and
voltages respectively stored in the first capacitor and the second
capacitor are charge-shared.
13. The display device of claim 12, wherein a ratio of the first
capacitor to the second capacitor is the deviation information.
14. The display device of claim 1, wherein the first compensator
comprises: a first switch unit connected to the sensing lines; a
multiplexer connected to the first switch; and a second switch unit
connected between the multiplexer and the sensing unit.
15. The display device of claim 14, wherein the first switch unit
includes first switches connected between the sensing lines and the
multiplexer, second switches connected between odd-numbered sensing
lines of the sensing lines and a reference power supply, and third
switches connected between even-numbered sensing lines and the
reference power supply.
16. The display device of claim 15, wherein the reference power
supply is set to a first voltage when the second switches are
turned on, and the reference power supply is set to a second
voltage different from the first voltage when the third switches
are turned on.
17. The display device of claim 16, the second switches and the
third switches are turned on at different times from each
other.
18. The display device of claim 15, further comprising an auxiliary
capacitor disposed between a first switch of the first switches and
the multiplexer and connected between the first switch and a ground
power supply.
19. The display device of claim 15, wherein the second switch unit
includes a fourth switch connected between the multiplexer and the
sensing unit, and a fifth switch connected between the multiplexer
and the sensing unit.
20. The display device of claim 19, wherein the multiplexer
sequentially connects the fourth switch to the odd numbered sensing
lines, and the multiplexer sequentially connects the fifth switch
to the even numbered sensing lines.
21. The display device of claim 14, wherein the first switch unit
includes first switches connected between the sensing lines and the
multiplexer, second switches connected between odd-numbered sensing
lines of the sensing lines and a first reference power supply, and
third switches connected between even numbered sensing lines of the
sensing lines and a second reference power supply.
22. The display device of claim 21, wherein the first reference
power supply is set to a first voltage, and the second reference
power supply is set to a second voltage different from the first
voltage.
23. The display device of claim 21, wherein the second switches and
the third switches are concurrently turned on and turned off.
24. The display device of claim 1, wherein the first compensator
includes a switch unit connected to the sensing lines, and a
multiplexer connected between the switch unit and the sensing
unit.
25. The display device of claim 24, wherein the switch unit
comprises: first switches connected between the sensing lines and
the multiplexer; second switches connected between odd numbered
sensing lines of the sensing lines and a first reference power
supply; third switches connected between even numbered sensing
lines of the sensing lines and a second reference power supply;
fourth switches connected between an ith sensing line and an
(i+1)th sensing line, where i is an odd number equal to and greater
than 1; and fifth switches connected between the (i+1)th sensing
line and an (i+2)th sensing line.
26. The display device of claim 25, wherein the first reference
power supply is set to a first voltage and the second reference
power supply is set to a second voltage different from the first
voltage.
27. The display device of claim 25, wherein the second switches and
the third switches are concurrently turned on.
28. The display device of claim 25, wherein the fourth switches and
the first switches are turned on after a voltage of the first
reference power supply is stored in the odd numbered sensing lines
and a voltage of the second reference power supply is stored in the
even numbered sensing lines, and the fifth switches and the first
switches are turned on after the voltage of the first reference
power supply is stored in the odd numbered sensing lines and the
voltage of the second reference power supply is stored in the even
numbered sensing lines.
29. The display device of claim 25, further comprising an auxiliary
capacitor disposed between a first switch of the first switches and
the multiplexer and connected between the first switch and a ground
power supply.
30. The display device of claim 1, further comprising a timing
controller which removes a deviation of the sensing lines from the
characteristic information of each of the pixels by the deviation
information.
31. The display device of claim 30, further comprising: a scan
driver which supplies scan signals to the scan lines; and a data
driver which generates data signals by second data and supplies the
data signals to the data lines, wherein the timing controller
generates the second data by first data supplied from an external
source corresponding to the characteristic information from which
the deviation is removed.
32. The display device of claim 1, wherein the sensing lines are
the data lines.
33. The display device of claim 1, wherein the sensing unit
comprises: an analog-to-digital converter which converts the
deviation information into first sensing data in a digital form and
converts the characteristic information into second sensing data in
a digital form; and a second compensator in which the first sensing
data and the second sensing data are stored.
34. A display device, comprising: a first sensing line and a second
sensing line connected to different pixels, respectively; a first
switch disposed between the first sensing line and a first node; a
second switch disposed between the second sensing line and the
first node; and a timing controller which controls the first switch
and the second switch.
35. The display device of claim 34, further comprising a third
switch connected between the first node and a reference power
supply.
36. The display device of claim 35, wherein the reference power
supply is set to a first voltage when the third switch and the
first switch are turned on, and the reference power supply is set
to a second voltage different from the first voltage when the third
switch and the second switch are turned on.
37. The display device of claim 35, further comprising: a fourth
switch connected to the first node; and an analog-to-digital
converter connected to the fourth switch and converting at least
one of a voltage applied to the first sensing line and a voltage
applied to the second sensing line into digital data.
38. The display device of claim 37, further comprising a
compensator which obtains a ratio of a first capacitor of the first
sensing line to a second capacitor of the second sensing line by
the digital data.
39. A driving method of a display device, the method comprising:
sensing deviation information of a first sensing line and a second
sensing line while supplying different voltages to the first
sensing line and the second sensing line, respectively; sensing
characteristic information of pixels connected to the first sensing
line and the second sensing line; and removing a deviation of the
first and second sensing lines from the characteristic information
by the deviation information.
40. The method of claim 39, wherein the sensing the deviation
information comprises: supplying a first voltage to the first
sensing line; supplying a second voltage different from the first
voltage to the second sensing line; generating first channel data
in a digital form by a voltage stored in a first capacitor
equivalently provided in the first sensing line corresponding to
the first voltage; generating second channel data in a digital form
by a voltage stored in a second capacitor equivalently provided in
the second sensing line corresponding to the second voltage; charge
sharing the first capacitor and the second capacitor; and
generating charge data in a digital provided by a charge share
voltage generated by the charge sharing.
41. The method of claim 40, further comprising obtaining a ratio of
the first capacitor to the second capacitor by the first channel
data, the second channel data and the charge data.
42. The method of claim 41, wherein the ratio of the first
capacitor to the second capacitor is the deviation information of
the first sensing line and the second sensing line.
Description
[0001] This application claims priority to Korean Patent
Application No. 10-2016-0121321, filed on Sep. 22, 2016, and all
the benefits accruing therefrom under 35 U.S.C. .sctn. 119, the
content of which in its entirety is herein incorporated by
reference.
BACKGROUND
1. Field
[0002] Exemplary embodiments of the invention relate to a display
device and a driving method thereof, and more particularly, to a
display device which improves image quality and a driving method
thereof.
2. Description of the Related Art
[0003] With a development of information technology, a display
device as a connection medium between a user and information has
been in high demand. In response, display devices such as a liquid
crystal display device, an organic light emitting display device,
etc., have been increasingly used.
[0004] An organic light emitting display device among the display
devices displays an image by pixels connected to a plurality of
scan lines and data lines. To this end, each of the pixels includes
an organic light emitting diode and a driving transistor.
[0005] The driving transistor controls an amount of current
supplied to the organic light emitting diode corresponding to a
data signal supplied from a data line of the plurality of data
lines. The organic light emitting diode emits light of a
predetermined brightness corresponding to the amount of current
supplied from the driving transistor.
[0006] The driving transistor included in each of the pixels
supplies a uniform current to the organic light emitting diode
corresponding to the data signal, so that the display device
displays a uniform quality of image. However, the driving
transistor included in each of the pixels has a characteristic
value including deviation.
[0007] An external compensation method for compensating for such a
characteristic deviation of the pixels from an external source has
been proposed. In the external compensation method, mobility and
threshold voltage information of the driving transistor included in
each of the pixels are sensed, and the data signal supplied to each
of the pixels according to the sensed information is controlled,
for example.
SUMMARY
[0008] An external compensation method may not accurately detect
characteristic deviations of pixels due to a deviation of each
channel of a corresponding driving transistor, and therefore there
is a limit in compensating the image quality accordingly.
[0009] Therefore, the invention provides a display device and a
driving method thereof to improve image quality by accurately
sensing a characteristic deviation of pixels regardless of a
channel deviation.
[0010] According to an exemplary embodiment of the invention, there
is provided a display device including pixels connected to data
lines and scan lines, a first compensator which is connected to
sensing lines and senses deviation information of the sensing lines
while supplying different voltages to adjacent sensing lines of the
sensing lines, and a sensing unit which is connected to the first
compensator and senses characteristic information of each of the
pixels.
[0011] In an exemplary embodiment, the first compensator may supply
a first voltage to a first capacitor provided in a predetermined
sensing line of the adjacent sensing lines and supplies a second
voltage different from the first voltage to a second capacitor
provided in an adjacent sensing line of the adjacent sensing
lines.
[0012] In an exemplary embodiment, the sensing unit may generate
first channel data in a digital form by a voltage stored in the
first capacitor and generate second channel data in a digital form
by a voltage stored in the second capacitor.
[0013] In an exemplary embodiment, the sensing unit may generate
charge data in a digital form by a charge share voltage generated
by charge-sharing the first capacitor and the second capacitor.
[0014] In an exemplary embodiment, the display device may further
include a timing controller which obtains a ratio of the first
capacitor to the second capacitor by the first channel data, the
second channel data, and the charge data, where the ratio of the
first capacitor to the second capacitor is the deviation
information.
[0015] In an exemplary embodiment, the first compensator may
include a multiplexer connected to the sensing lines and a switch
unit connected between the multiplexer and the sensing unit.
[0016] In an exemplary embodiment, the switch unit may include a
first switch connected between the multiplexer and a first node, a
second switch connected between the multiplexer and the first node,
a third switch connected between the first node and a reference
power supply, and a fourth switch connected between the first node
and the sensing unit.
[0017] In an exemplary embodiment, the multiplexer may sequentially
connect the first switch to a first sensing line to an (m-1)th
sensing line of the sensing lines where m is a natural number
greater than two, and sequentially connect the second switch to a
second sensing line to an mth sensing line of the sensing
lines.
[0018] In an exemplary embodiment, the third switch may be turned
on to supply a first voltage of the reference power supply to a
predetermined sensing line of the adjacent sensing lines connected
to the first switch during at least a portion of a period in which
the first switch is turned on, and the third switch may be turned
on to supply a second voltage of the reference power supply to an
adjacent sensing line of the adjacent sensing lines connected to
the second switch during at least a portion of a period in which
the second switch is turned on
[0019] In an exemplary embodiment, the first voltage and the second
voltage may be set to different values.
[0020] In an exemplary embodiment, the first voltage may be set to
be higher than the second voltage.
[0021] In an exemplary embodiment, after the first voltage is
stored in a first capacitor equivalently provided in the
predetermined sensing line, and the second voltage is stored in a
second capacitor equivalently provided in the adjacent sensing
line, the first switch and the second switch may be turned on, and
voltages respectively stored in the first capacitor and the second
capacitor may be charge-shared.
[0022] In an exemplary embodiment, a ratio of the first capacitor
to the second capacitor may be the deviation information.
[0023] In an exemplary embodiment, the first compensator may
include a first switch unit connected to the sensing lines, a
multiplexer connected to the first switch, and a second switch unit
connected between the multiplexer and the sensing unit.
[0024] In an exemplary embodiment, the first switch unit may
include first switches connected between the sensing lines and the
multiplexer, second switches connected between odd-numbered sensing
lines of the sensing lines and a reference power supply, and third
switches connected between even-numbered sensing lines and the
reference power supply.
[0025] In an exemplary embodiment, the reference power supply may
be set to a first voltage when the second switches are turned on,
and the reference power supply may be set to a second voltage
different from the first voltage when the third switches are turned
on.
[0026] In an exemplary embodiment, the second switches and the
third switches may be turned on at different times from each
other.
[0027] In an exemplary embodiment, the display device may further
include an auxiliary capacitor disposed between a first switch of
the first switches and the multiplexer and connected between the
first switch and a ground power supply.
[0028] In an exemplary embodiment, the second switch unit may
include a fourth switch connected between the multiplexer and the
sensing unit, and a fifth switch connected between the multiplexer
and the sensing unit.
[0029] In an exemplary embodiment, the multiplexer may sequentially
connect the fourth switch to the odd numbered sensing lines, and
the multiplexer may sequentially connect the fifth switch to the
even numbered sensing lines.
[0030] In an exemplary embodiment, the first switch unit may
include first switches connected between the sensing lines and the
multiplexer, second switches connected between odd-numbered sensing
lines of the sensing lines and a first reference power supply, and
third switches connected between even numbered sensing lines of the
sensing lines and a second reference power supply.
[0031] In an exemplary embodiment, the first reference power supply
may be set to a first voltage, and the second reference power
supply may be set to a second voltage different from the first
voltage.
[0032] In an exemplary embodiment, the second switches and the
third switches may be concurrently turned on and turned off.
[0033] In an exemplary embodiment, the first compensator may
include a switch unit connected to the sensing lines, and a
multiplexer connected between the switch unit and the sensing
unit.
[0034] In an exemplary embodiment, the switch unit may include
first switches connected between the sensing lines and the
multiplexer, second switches connected between odd numbered sensing
lines of the sensing lines and a first reference power supply,
third switches connected between even numbered sensing lines of the
sensing lines and a second reference power supply, fourth switches
connected between an ith sensing line (where i is an odd number
equal to and greater than 1, i.e., i is 1, 3, 5, 7 . . . ) and an
(i+1)th sensing line, and fifth switches connected between the
(i+1)th sensing line and an (i+2)th sensing line.
[0035] In an exemplary embodiment, the first reference power supply
may be set to a first voltage and the second reference power supply
may be set to a second voltage different from the first
voltage.
[0036] In an exemplary embodiment, the second switches and the
third switches may be concurrently turned on.
[0037] In an exemplary embodiment, after a voltage of the first
reference power supply is stored in the odd numbered sensing lines
and a voltage of the second reference power supply is stored in the
even numbered sensing lines, the fourth switches and the first
switches may be turned on, and after the voltage of the first
reference power supply is stored in the odd numbered sensing lines
and the voltage of the second reference power supply is stored in
the even numbered sensing lines, the fifth switches and the first
switches may be turned on.
[0038] In an exemplary embodiment, the display device may further
include an auxiliary capacitor disposed between a first switch of
the first switches and the multiplexer and connected between the
first switch and a ground power supply.
[0039] In an exemplary embodiment, the display device may further
include a timing controller which removes a deviation of the
sensing lines from the characteristic information of each of the
pixels by the deviation information.
[0040] In an exemplary embodiment, the display device may further
includes a scan driver which supplies scan signals to the scan
lines, and a data driver which generates data signals by second
data and supplies the data signals to the data lines, where the
timing controller generates the second data by first data supplied
from an external source corresponding to the characteristic
information from which the deviation is removed.
[0041] In an exemplary embodiment, the sensing lines may be the
data lines.
[0042] In an exemplary embodiment, the sensing unit may include an
analog-to-digital converter which converts the deviation
information into first sensing data in a digital form and converts
the characteristic information into second sensing data in a
digital form, and a second compensator in which the first sensing
data and the second sensing data are stored.
[0043] In an exemplary embodiment, a display device may include a
first sensing line and a second sensing line connected to different
pixels, respectively, a first switch disposed between the first
sensing line and a first node, a second switch disposed between the
second sensing line and the first node, and a timing controller
which controls the first switch and the second switch.
[0044] In an exemplary embodiment, the display device may further
include a third switch connected between the first node and a
reference power supply.
[0045] In an exemplary embodiment, when the third switch and the
first switch are turned on, the reference power supply may be set
to a first voltage, and when the third switch and the second switch
are turned on, the reference power supply may be set to a second
voltage different from the first voltage.
[0046] In an exemplary embodiment, the display device may further
includes a fourth switch connected to the first node, and an
analog-to-digital converter connected to the fourth switch and
converting at least one of a voltage applied to the first sensing
line and a voltage applied to the second sensing line into digital
data.
[0047] In an exemplary embodiment, the display device may further
include a compensator which obtains a ratio of a first capacitor of
the first sensing line to a second capacitor of the second sensing
line by the digital data.
[0048] In an exemplary embodiment, a driving method of a display
device, the method includes sensing deviation information of a
first sensing line and a second sensing line while supplying
different voltages to the first sensing line and the second sensing
line, respectively, sensing characteristic information of pixels
connected to the first sensing line and the second sensing line,
and removing a deviation of the first and second sensing lines from
the characteristic information by the deviation information.
[0049] In an exemplary embodiment, the sensing of the deviation
information may include supplying a first voltage to the first
sensing line, supplying a second voltage different from the first
voltage to the second sensing line, generating first channel data
in a digital form by a voltage stored in a first capacitor
equivalently provided in the first sensing line corresponding to
the first voltage, generating second channel data in a digital form
by a voltage stored in a second capacitor equivalently provided in
the second sensing line corresponding to the second voltage, charge
sharing the first capacitor and the second capacitor, and
generating charge data in a digital provided by a charge share
voltage generated by the charge sharing.
[0050] In an exemplary embodiment, the method may further include
obtaining a ratio of the first capacitor to the second capacitor by
the first channel data, the second channel data and the charge
data.
[0051] In an exemplary embodiment, the ratio of the first capacitor
to the second capacitor may be the deviation information of the
first sensing line and the second sensing line.
BRIEF DESCRIPTION OF THE DRAWINGS
[0052] The above and other exemplary embodiments, advantages and
features of this disclosure will become more apparent by describing
in further detail exemplary embodiments thereof with reference to
the accompanying drawings, in which:
[0053] FIG. 1 is a diagram illustrating an exemplary embodiment of
a display device according to the invention;
[0054] FIGS. 2A and 2B are diagrams illustrating exemplary
embodiments of a pixel shown in FIG. 1;
[0055] FIG. 3 is a diagram illustrating an exemplary embodiment of
a first compensator and a sensing unit shown in FIG. 1;
[0056] FIG. 4 is a waveform diagram illustrating an operation
process of the first compensator shown in FIG. 3;
[0057] FIG. 5 is a diagram illustrating another exemplary
embodiment of the first compensator shown in FIG. 1;
[0058] FIG. 6 is a diagram illustrating another exemplary
embodiment of the first compensator shown in FIG. 5;
[0059] FIG. 7 is a waveform diagram illustrating an operation
process of the first compensator shown in FIG. 5;
[0060] FIG. 8 is a diagram illustrating another exemplary
embodiment of the first compensator shown in FIG. 1;
[0061] FIG. 9 is a diagram illustrating another exemplary
embodiment of the first compensator shown in FIG. 8;
[0062] FIG. 10 is a waveform diagram illustrating an operation
process of the first compensator shown in FIG. 8;
[0063] FIG. 11 is a diagram illustrating another exemplary
embodiment of the first compensator shown in FIG. 1;
[0064] FIG. 12 is a diagram illustrating another exemplary
embodiment of the first compensator shown in FIG. 11;
[0065] FIG. 13 is a diagram illustrating an operation process of
the first compensator shown in FIG. 11; and
[0066] FIG. 14 is a diagram illustrating an exemplary embodiment of
a driving method for sensing channel deviation information
according to the invention.
DETAILED DESCRIPTION
[0067] Hereinafter, embodiments of the invention will be described
in detail with reference to the accompanying drawings, and the
details necessary for those skilled in the art to understand the
contents of the invention will be described in detail. However, the
invention may be embodied in many different forms within the scope
of the appended claims, so that the exemplary embodiments described
below are exemplary only, regardless of whether they are expressed
or not.
[0068] That is, the invention is not limited to the exemplary
embodiments described below, but may be embodied in various forms.
In the following description, when a portion is connected to
another portion, it means they are electrically connected to each
other with another element interposed therebetween. It is to be
noted that, in the drawings, the same constituent elements are
denoted by the same reference numerals and number as possible even
though they are shown in different drawings.
[0069] The invention now will be described more fully hereinafter
with reference to the accompanying drawings, in which various
embodiments are shown. This invention may, however, be embodied in
many different forms, and should not be construed as limited to the
exemplary embodiments set forth herein. Rather, these embodiments
are provided so that this invention will be thorough and complete,
and will fully convey the scope of the invention to those skilled
in the art. Like reference numerals refer to like elements
throughout.
[0070] It will be understood that when an element is referred to as
being "on" another element, it can be directly on the other element
or intervening elements may be therebetween. In contrast, when an
element is referred to as being "directly on" another element,
there are no intervening elements present.
[0071] It will be understood that, although the terms "first,"
"second," "third" etc. may be used herein to describe various
elements, components, regions, layers and/or sections, these
elements, components, regions, layers and/or sections should not be
limited by these terms. These terms are only used to distinguish
one element, component, region, layer or section from another
element, component, region, layer or section. Thus, "a first
element," "component," "region," "layer" or "section" discussed
below could be termed a second element, component, region, layer or
section without departing from the teachings herein.
[0072] The terminology used herein is for the purpose of describing
particular embodiments only and is not intended to be limiting. As
used herein, the singular forms "a," "an," and "the" are intended
to include the plural forms, including "at least one," unless the
content clearly indicates otherwise. "Or" means "and/or." As used
herein, the term "and/or" includes any and all combinations of one
or more of the associated listed items. It will be further
understood that the terms "comprises" and/or "comprising," or
"includes" and/or "including" when used in this specification,
specify the presence of stated features, regions, integers, steps,
operations, elements, and/or components, but do not preclude the
presence or addition of one or more other features, regions,
integers, steps, operations, elements, components, and/or groups
thereof.
[0073] Furthermore, relative terms, such as "lower" or "bottom" and
"upper" or "top," may be used herein to describe one element's
relationship to another element as illustrated in the Figures. It
will be understood that relative terms are intended to encompass
different orientations of the device in addition to the orientation
depicted in the Figures. In an exemplary embodiment, when the
device in one of the figures is turned over, elements described as
being on the "lower" side of other elements would then be oriented
on "upper" sides of the other elements. The exemplary term "lower,"
can therefore, encompasses both an orientation of "lower" and
"upper," depending on the particular orientation of the figure.
Similarly, when the device in one of the figures is turned over,
elements described as "below" or "beneath" other elements would
then be oriented "above" the other elements. The exemplary terms
"below" or "beneath" can, therefore, encompass both an orientation
of above and below.
[0074] "About" or "approximately" as used herein is inclusive of
the stated value and means within an acceptable range of deviation
for the particular value as determined by one of ordinary skill in
the art, considering the measurement in question and the error
associated with measurement of the particular quantity (i.e., the
limitations of the measurement system). For example, "about" can
mean within one or more standard deviations, or within .+-.30%,
20%, 10%, 5% of the stated value.
[0075] Unless otherwise defined, all terms (including technical and
scientific terms) used herein have the same meaning as commonly
understood by one of ordinary skill in the art to which this
invention belongs. It will be further understood that terms, such
as those defined in commonly used dictionaries, should be
interpreted as having a meaning that is consistent with their
meaning in the context of the relevant art and the invention, and
will not be interpreted in an idealized or overly formal sense
unless expressly so defined herein.
[0076] Exemplary embodiments are described herein with reference to
cross section illustrations that are schematic illustrations of
idealized embodiments. As such, variations from the shapes of the
illustrations as a result, for example, of manufacturing techniques
and/or tolerances, are to be expected. Thus, embodiments described
herein should not be construed as limited to the particular shapes
of regions as illustrated herein but are to include deviations in
shapes that result, for example, from manufacturing. In an
exemplary embodiment, a region illustrated or described as flat
may, typically, have rough and/or nonlinear features. Moreover,
sharp angles that are illustrated may be rounded. Thus, the regions
illustrated in the figures are schematic in nature and their shapes
are not intended to illustrate the precise shape of a region and
are not intended to limit the scope of the claims.
[0077] FIG. 1 is a diagram illustrating a display device according
to an exemplary embodiment of the invention. In FIG. 1, for
convenience of explanation, an exemplary embodiment of the
invention will be described on the assumption that the display
device is an organic light emitting display device. However, the
display device of the invention is not limited to the organic light
emitting display device.
[0078] Referring to FIG. 1, a display device according to an
exemplary embodiment of the invention may include a scan driver
100, a data driver 200, a control line driver 300, a first
compensator 400, a sensing unit 450, a pixel unit 500, and a timing
controller 600.
[0079] The scan driver 100 may supply scan signals to scan lines S1
to Sn corresponding to a control of the timing controller 600. In
an exemplary embodiment, the scan driver 100 may sequentially
supply the scan signals to the scan lines S1 to Sn, for example.
When the scan signals are sequentially supplied to the scan lines
S1 to Sn, pixels 510 may be selected on a horizontal line basis. To
this end, the scan signal may be set to a gate-on voltage at which
transistors included in the pixels 510 may be turned on.
[0080] The data driver 200 may generate a data signal corresponding
to second data Data2 supplied from the timing controller 600. The
data driver 200 that generates the data signal may supply the data
signals to data lines D1 to Dm. The data signals supplied to the
data lines D1 to Dm may be supplied to the pixels 510 selected by
the scan signals. The pixels 510 may emit light of a predetermined
brightness corresponding to the data signals, and accordingly a
predetermined image may be displayed in the pixel unit 500.
[0081] The second data Data2 described above may be a value based
on first data Data1 input from an external source corresponding to
the image to be displayed on the pixel unit 500, and may be set to
a value obtained by changing the first data Data1 so that deviation
of a driving transistor included in each of the pixels 510 may be
compensated.
[0082] The control line driver 300 may supply control signals to
control lines CL1 to CLn in response to control of the timing
controller 600. In an exemplary embodiment, during a period in
which characteristic information of each of the pixels 510 is
sensed, for example, during a sensing period, the control line
driver 300 may sequentially supply the control signals to the
control lines CL1 to CLn, for example. According to an exemplary
embodiment, the control signal may be set to a gate-on voltage by
which transistors included in the pixels 510 may be turned on. In
such a case, the pixels 510 supplied with the control signals may
be electrically connected to sensing lines SEN1 to SENm.
[0083] The control line driver 300 may not necessarily be provided
in the exemplary embodiment of the invention. In an exemplary
embodiment, the scan driver 100 may supply the control signals to
the control lines CL1 to CLn in replacement of the control line
driver 300, for example. In an exemplary embodiment, instead of
forming separate control lines CL1 to CLn, the electrical
connections between the pixels 510 and the sensing lines SEN1 to
SENm may be controlled by the scan lines S1 to Sn during the
sensing period.
[0084] The first compensator 400 may be connected to the sensing
lines SEN1 to SENm. The first compensator 400 may sense deviation
information (i.e., channel deviation information) of each of the
sensing lines SEN1 to SENm. In an exemplary embodiment, the first
compensator 400 may sense a capacitance of a parasitic capacitor
provided in each of the sensing lines SEN1 to SENm as the channel
deviation information. A detailed description thereof will be given
below, for example.
[0085] In FIG. 1, the first compensator 400 is connected to the
sensing lines SEN1 to SENm, but the invention is not limited
thereto. In an exemplary embodiment, the invention may be applied
to various types of external compensation methods which are known
in the art, and the first compensator 400 may be connected to the
data lines D1 to Dm, for example. In such a case, the first
compensator 400 may sense a capacitance of a parasitic capacitor of
each of the data lines D1 to Dm as the channel deviation
information.
[0086] The sensing unit 450 may sense characteristic information of
each of the pixels 510. In an exemplary embodiment, the sensing
unit 450 may sense threshold voltage information, mobility
information of the driving transistor included in each of the
pixels 510, and/or deterioration information of the organic light
emitting diode as the characteristic information of each of the
pixels 510, for example.
[0087] The sensing unit 450 may convert deviation information of
the channel sensed in the first compensator 400 into first sensing
data in a digital form and the characteristic information of the
pixels 510 into second sensing data in a digital form to output the
first sensing data and the second sensing data. To this end, the
sensing unit 450 may include an analog-to-digital converter ("ADC")
(not shown). The first sensing data and the second sensing data
output from the sensing unit 450 may be stored in a memory which is
not shown.
[0088] The first sensing data and the second sensing data stored in
the memory may be used to convert the first data Data1 into the
second data Data2 so that the characteristic deviations of the
pixels 510 may be compensated. In an exemplary embodiment, the
timing controller 600 may remove the channel deviation from the
second sensing data by the first sensing data and generate the
second data Data2 by the second sensing data from which the channel
deviation is removed, for example. Thus, the characteristic
deviations of the pixels 510 may be accurately compensated
regardless of the channel deviation.
[0089] The pixel unit 500 may include the pixels 510 arranged to be
connected to the scan lines S1 to Sn, the control lines CL1 to CLn,
the sensing lines SEN1 to SENm, and the data lines D1 to Dm. In
such a case, the pixel unit 500 may be set as a display area for
displaying a predetermined image. Each of the pixels 510 may be
electrically connected to a first driving power supply ELVDD and a
second driving power supply ELVSS. The first driving power supply
ELVDD may be set to a voltage higher than the second driving power
supply ELVSS.
[0090] Each of the pixels 510 may include the driving transistor
and the organic light emitting diode. The driving transistor may
control the amount of current flowing from the first driving power
supply ELVDD to the second driving power supply ELVSS via the
organic light emitting diode corresponding to the data signal. The
organic light emitting diode may emit light of a brightness
corresponding to the amount of current supplied from the driving
transistor. However, when a data signal corresponding to a black
grayscale is supplied, the driving transistor may control the
current not to flow to the organic light emitting diode, so that
the organic light emitting diode may be set in a non-light emitting
state.
[0091] The timing controller 600 may control the scan driver 100,
the data driver 200, the first compensator 400, and the sensing
unit 450. In addition, the timing controller 600 may generate the
second data Data2 by changing bits of the first data Data1
corresponding to the first sensing data and the second sensing
data.
[0092] FIG. 1 shows only the configuration desired for explanation
of the invention, and various configurations may be added to an
actual display device. In an exemplary embodiment, one or more
dummy scan lines may be additionally included for driving
stability, for example. In addition, the scan driver 100, the data
driver 200, the first compensator 400, the sensing unit 450 and/or
the timing controller 600 may be disposed (e.g., mounted) on a
panel (not shown) together with the pixel unit 500.
[0093] FIGS. 2A and 2B are diagrams illustrating an exemplary
embodiment of a pixel shown in FIG. 1 In FIG. 2A, a pixel connected
to an mth data line Dm and an nth scan line Sn are shown for
convenience of explanation.
[0094] Referring to FIG. 2A, the pixel 510 according to an
exemplary embodiment of the invention may include an organic light
emitting diode OLED and a pixel circuit 512.
[0095] An anode electrode of the organic light emitting diode OLED
may be connected to the pixel circuit 512, and a cathode electrode
may be connected to the second driving power supply ELVSS. The
organic light emitting diode OLED may emit light of a brightness
corresponding to the amount of current supplied from the pixel
circuit 512.
[0096] The pixel circuit 512 may control the amount of current
flowing from the first driving power supply ELVDD to the second
driving power data driver supply ELVSS via the organic light
emitting diode OLED corresponding to the data signal. To this end,
the pixel circuit 512 may include a first transistor M1, a second
transistor M2, a third transistor M3, and a storage capacitor
Cst.
[0097] In an exemplary embodiment, at least one of the first to
third transistors M1 to M3 may be an oxide semiconductor thin film
transistor ("TFT") including an active layer including an oxide
semiconductor, for example. In an exemplary embodiment, at least
one of the first to third transistors M1 to M3 may be a
low-temperature polycrystalline silicon ("LTPS") TFT including an
active layer including polysilicon, for example.
[0098] A first electrode of the first transistor M1 may be
connected to the first driving power supply ELVDD and a second
electrode of the first transistor M1 may be connected to the anode
electrode of the organic light emitting diode OLED. A gate
electrode of the first transistor M1 may be connected to a first
node N1. The first transistor M1 may control the amount of current
flowing from the first driving power supply ELVDD to the second
driving power supply ELVSS via the organic light emitting diode
OLED corresponding to a voltage of the first node N1.
[0099] A first electrode of the second transistor M2 may be
connected to the data line Dm, and a second electrode of the second
transistor M2 may be connected to the first node N1. In addition, a
gate electrode of the second transistor M2 may be connected to the
scan line Sn. The second transistor M2 may be turned on to
electrically connect the data line Dm and the first node N1 when
the scan signal is supplied to the scan line Sn.
[0100] A first electrode of the third transistor M3 may be
connected to the second electrode of the first transistor M1, and a
second electrode of the third transistor M3 may be connected to the
sensing line SENm. A gate electrode of the third transistor M3 may
be connected to the control line CLn. The third transistor M3 may
be turned on to electrically connect the sensing line SENm and the
second electrode of the first transistor M1 when the scan signal is
supplied to the control line CLn.
[0101] The storage capacitor Cst may be connected between the first
node N1 and the second electrode of the first transistor M1. The
storage capacitor Cst may store the voltage of the first node
N1.
[0102] A circuit structure of the pixel 510 in the exemplary
embodiment of the invention is not limited to FIG. 2A. In an
exemplary embodiment of the invention, the organic light emitting
diode OLED may be positioned between the first driving power supply
ELVDD and the first electrode of the first transistor M1 as shown
in FIG. 2B, for example. That is, in the exemplary embodiment of
the invention, the circuit structure of the pixel 510 may be
variously changed to include the third transistor M3 for sensing
the characteristic information of the first transistor M1.
[0103] In an exemplary embodiment, although the transistors M1 to
M3 are shown as an n-channel metal-oxide semiconductor ("NMOS")
transistor in FIGS. 2A and 2B, the invention is not limited
thereto. In another exemplary embodiment, at least one of the
transistors M1 to M3 may include a p-channel metal-oxide
semiconductor ("PMOS") transistor, for example.
[0104] The brightness of the pixel 510 described above may be
determined by the data signal. However, a characteristic value of
the first transistor M1 may be further reflected to the brightness
of the pixel 510. That is, in the exemplary embodiment of the
invention, the external compensation method is applied, which
senses the characteristic information of the first transistor M1
during the sensing period and changes the first data Data1 by
reflecting the sensed characteristic information. In such a case, a
uniform quality of image may be displayed in the pixel unit 500
regardless of a characteristic deviation of the first transistor
M1.
[0105] According to an exemplary embodiment, in the invention, the
deviation information of the sensing lines SEN1 to SENm may be
sensed and the characteristic information of the pixels 510 may be
corrected by reflecting the deviation information. That is, in the
exemplary embodiment of the invention, the characteristic
information of the pixels 510 may be accurately sensed regardless
of the deviations of the sensing lines SEN1 to SENm, thereby
improving the accuracy of compensation.
[0106] According to an exemplary embodiment, a first sensing period
for sensing the deviation information of the sensing lines SEN1 to
SENm, and a second sensing period for sensing the characteristic
information of the first transistor M1 included in each of the
pixels 510 may be performed at least once before shipment of the
display device. Initial characteristic information of the first
transistors M1 may be stored before the shipment of the display
device, and the uniform quality of images may be displayed in the
pixel unit 500 by the initial characteristic information and
correcting the first data Data1 (that is, generating the second
data Data2).
[0107] In addition, the second sensing period may be performed
every predetermined period of time even after an actual use of the
display device. In an exemplary embodiment, the second sensing
period may be arranged at a portion of periods of time at which the
display device is turned on and/or off at every predetermined
period of time, for example. Thus, although the characteristic of
the driving transistor included in each of the pixels 510 changes
in accordance with a usage amount, the characteristic information
may be updated in real time and reflected in the generation of the
data signal. Therefore, the pixel unit 500 may continuously display
the uniform quality of image.
[0108] FIG. 3 is a diagram illustrating an exemplary embodiment of
the first compensator and the sensing unit shown in FIG. 1. An ADC
460 and a second compensator 470 shown in FIG. 3 may include at
least one or more channels and share a plurality of channels.
Capacitors C1 to Cm shown in FIG. 3 may be equivalent to parasitic
capacitors of the sensing lines SEN1 to SENm, respectively.
[0109] Referring to FIG. 3, the first compensator 400 according to
an exemplary embodiment of the invention may include a multiplexer
410 and a switch unit 420.
[0110] The multiplexer 410 may connect at least one of the sensing
lines SEN1 to SENm to the switch unit 420. In an exemplary
embodiment, the multiplexer 410 may sequentially connect two
sensing lines (two of the sensing lines SEN1 to SENm) to the switch
unit 420, for example. To this end, the multiplexer 410 may be
determined at a ratio of m:2, for example.
[0111] The switch unit 420 may be connected to at least one of the
sensing lines SEN1 to SENm via the multiplexer 410 and connect the
sensing lines SEN1 to SENm connected thereto (at least one of the
sensing lines SEN1 to SENm) to a reference power supply Vref or the
sensing unit 450. To this end, the switch unit 420 may include a
first switch SW1, a second switch SW2, a third switch SW3, and a
fourth switch SW4, which are turned on or off in response to
control of the timing controller 600.
[0112] The first switch SW1 may be disposed between the multiplexer
410 and the first node N1. The multiplexer 410 and the first node
N1 may be electrically connected when the first switch SW1 is
turned on.
[0113] The second switch SW2 may be disposed between the
multiplexer 410 and the first node N1. The multiplexer 410 and the
first node N1 may be electrically connected when the second switch
SW2 is turned on.
[0114] The third switch SW3 may be disposed between the first node
N1 and the reference power supply Vref A voltage of the reference
power supply Vref may be supplied to the first node N1 when the
third switch SW3 is turned on.
[0115] The fourth switch SW4 may be disposed between the first node
N1 and the sensing unit 450. The first node N1 and the sensing unit
450 may be electrically connected when the fourth switch SW4 is
turned on.
[0116] The sensing unit 450 may include the ADC 460 and the second
compensator 470 according to an exemplary embodiment of the
invention.
[0117] The ADC 460 may generate the first sensing data in a digital
form by the voltage applied to each of the sensing lines SEN1 to
SENm during the first sensing period. A detailed description
thereof will be given below.
[0118] A predetermined voltage may be applied to the sensing lines
SEN1 to SENm corresponding to the characteristic variations of the
pixels 510 during the second sensing period in which the
characteristic deviations of the pixels 510 are sensed. The ADC 460
may convert the voltages applied to the sensing lines SEN1 to SENm
to second sensing data in a digital form and supply the second
sensing data to the second compensator 470.
[0119] The second compensator 470 may store the first sensing data
and the second sensing data supplied from the ADC 460. To this end,
the second compensator 470 may further include a memory (not
shown). The second compensator 470 may further include various
configurations publicly known at the current stage and may be
included in the timing controller 600.
[0120] The timing controller 600 may remove deviations between the
channels (that is, the sensing lines SEN1 to SENm) in the second
sensing data by the first sensing data. Thereafter, the timing
controller 600 may generate the second data Data2 (refer to FIG. 1)
by changing the first data Data1 (refer to FIG. 1) corresponding to
the second sensing data from which the deviations between the
channels are removed.
[0121] FIG. 4 is a waveform diagram illustrating an operation
process of the first compensator shown in FIG. 3
[0122] Referring to FIG. 4, the multiplexer 410 may sequentially
connect the first switch SW1 to a first sensing line SEN1 to an
(m-1)th sensing line SENm-1. In addition, the multiplexer 410 may
sequentially connect the second switch SW2 to a second sensing line
SEN2 to an mth sensing line SENm. It is assumed that the first
switch SW1 is connected to the first sensing line SEN1 and the
second switch SW2 is connected to the second sensing line SEN2, for
example.
[0123] The operation process will be described as below. The
reference power supply Vref may be set to the first voltage V1
during the first period T1. The first switch SW1 may be turned on
during the first period T1. In addition, the third switch SW3 and
the fourth switch SW4 may be sequentially turned on during the
first period T1.
[0124] The first sensing line SEN1 may be connected to the first
node N1 when the first switch SW1 is turned on. The first voltage
V1 of the reference power supply Vref may be supplied to the first
sensing line SEN1 via the first node N1 and the first switch SW1
when the third switch SW3 is turned on. The voltage corresponding
to the first voltage V1 may be stored in a first capacitor C1. The
amount of charge of the first sensing line SEN1 may be represented
by the following Equation 1:
Q1=C1.times.V1 [Equation 1]
[0125] In Equation 1, C1 denotes the first capacitor C1, V1 denotes
the first voltage, and Q1 denotes the charge amount.
[0126] The third switch SW3 may be turned off and the fourth switch
SW4 may be turned on. The first sensing line SEN1 may be connected
to the ADC 460 via the first switch SW1, the first node N1 and the
fourth switch SW4 when the fourth switch SW4 is turned on. The
voltage stored in the first capacitor C1 may be supplied to the ADC
460. The ADC 460 may store the voltage stored in the first
capacitor C1 to the second compensator 470 as first channel data in
a digital form.
[0127] In a second period T2, the reference power supply Vref may
be set to a second voltage V2 which is different from the first
voltage V1. In an exemplary embodiment, the second voltage V2 may
be set to a voltage lower than the first voltage V1, for example.
The second switch SW2 may be turned on during the second period T2.
The third switch SW3 and the fourth switch SW4 may be sequentially
turned on during the second period T2.
[0128] The second sensing line SEN2 may be connected to the first
node N1 when the second switch SW2 is turned on. The second voltage
V2 of the reference power supply Vref may be supplied to the second
sensing line SEN2 via the first node N1 and the second switch SW2
when the third switch SW3 is turned on. A voltage corresponding to
the second voltage V2 may be stored in the second capacitor C2. The
amount of charge of the second sensing line SEN2 may be represented
by the following Equation 2:
Q2=C2.times.V2. [Equation 2]
[0129] In Equation 2, C2 denotes the second capacitor C2, V2
denotes the second voltage, and Q2 denotes the charge amount.
[0130] The third switch SW3 may be turned off and the fourth switch
SW4 may be turned on. The second sensing line SEN2 may be connected
to the ADC 460 via the second switch SW2, the first node N1, and
the fourth switch SW4 when the fourth switch SW4 is turned on. The
voltage stored in the second capacitor C2 may be supplied to the
ADC 460. The ADC 460 may store the voltage stored in the second
capacitor C2 to the second compensator 470 as second channel data
in digital a form.
[0131] In a third period T3, the first switch SW1 and the second
switch SW2 may be turned on. The fourth switch SW4 may be turned on
so that turn-on periods of the first switch SW1 and the second
switch SW2 are at least partially overlapped.
[0132] The first sensing line SEN1 and the second sensing line SEN2
may be electrically connected when the first switch SW1 and the
second switch SW2 are turned on, respectively. The voltages stored
in the first capacitor C1 and the second capacitor C2 may be
charge-shared, so that a predetermined charge share voltage may be
applied to the first sensing line SEN1 and the second sensing line
SEN2. The charge share voltage may be represented by the following
Equation 3:
C1.times.V1+C2.times.V2=(C1+C2).times.Vshare. [Equation 3]
[0133] In Equation 3, Vshare denotes the charge share voltage.
[0134] After the first sensing line SEN1 and the second sensing
line SEN2 are electrically connected, the fourth switch SW4 may be
turned on. The first sensing line SEN1 and the second sensing line
SEN2 may be electrically connected to the ADC 460 when the fourth
switch SW4 is turned on. The charge share voltage may be supplied
to the ADC 460, and the ADC 460 may store the charge share voltage
as the first charge data in the second compensator 470.
[0135] When the first channel data, the second channel data, and
the first charge data are used, a ratio of the first capacitor C1
to the second capacitor C2, that is, the channel deviation
information may be represented by the following Equation 4:
C1/C2=(Vshare-V2)/(V1-Vshare). [Equation 4]
[0136] The ratio of the first capacitor C1 to the second capacitor
C2 may be stored in the second compensator 470 as the first sensing
data.
[0137] The multiplexer 410 may sequentially connect the first
switch SW1 to the second sensing line SEN2 to the (m-1)th sensing
line SENm-1 and connect the second switch SW2 to a third sensing
line SEN3 to the mth sensing line SENm.
[0138] In addition, each time when the first switch SW1 and the
second switch SW2 are connected to the sensing lines, the deviation
information of each of the sensing lines SEN1 to SENm may be sensed
while repeating the first period T1 to the third period T3. In an
exemplary embodiment, the ratio of the first capacitor C1 to each
of the second to mth capacitors C2 to Cm (e.g., C1/C2, C1/C3 . . .
C1/Cm) may be stored in the second compensator 470, for
example.
[0139] The timing controller 600 may show the channel deviation
information by the first sensing data, and correct the second
sensing data by reflecting the channel deviation information
accordingly. The second data Data2 may be generated corresponding
to the characteristic information of each of the pixels 510 (refer
to FIG. 1) regardless of the channel deviation, thereby improving
the image quality.
[0140] FIG. 5 is a diagram illustrating another exemplary
embodiment of the first compensator shown in FIG. 1
[0141] Referring to FIG. 5, the first compensator 400 according to
another embodiment of the invention may include a first switch unit
422, a multiplexer 412, and a second switch unit 430.
[0142] The first switch unit 422 may connect the sensing lines SEN1
to SENm to the reference power supply Vref or the multiplexer 412.
To this end, the first switch unit 422 may include a first switch
SW1', a second switch SW2', and a third switch SW3'.
[0143] The first switch SW1' may be disposed between each of the
sensing lines SEN1 to SENm and the multiplexer 412. The sensing
lines SEN1 to SENm may be connected to the multiplexer 412 when the
first switch SW1' is turned on.
[0144] The second switch SW2' may be disposed between each of the
odd-numbered sensing lines SEN1, SEN3, . . . , SENm-1 and the
reference power supply Vref. The voltage of the reference power
supply Vref may be supplied to the odd-numbered sensing lines SEN1,
SEN3, . . . , SENm-1 when the second switch SW2' is turned on.
[0145] The third switch SW3' may be disposed between each of the
even-numbered sensing lines SEN2, SEN4, . . . , SENm and the
reference power supply Vref. The voltage of the reference power
supply Vref may be supplied to the even-numbered sensing lines
SEN2, SEN4, . . . , SENm when the third switch SW3' is turned
on.
[0146] The multiplexer 412 may connect at least one of the sensing
lines SEN 1 to SENm to the second switch unit 430 via the first
switch unit 422. In an exemplary embodiment, the even-numbered
sensing lines SEN2, SEN4, . . . , SENm may be sequentially
connected to a fifth switch SW5, for example. In addition, the
multiplexer 412 may sequentially connect at least a portion of the
odd-numbered sensing lines SEN1, SEN3, . . . , SENm-1 to a fourth
switch SW4'. A detailed description thereof will be described below
in connection with the waveform view.
[0147] The second switch unit 430 may be connected between the
multiplexer 412 and the ADC 460. The second switch unit 430 may
include a fourth switch SW4' and the fifth switch SW5.
[0148] The fourth switch SW4' may sequentially connect at least a
portion of the odd-numbered sensing lines SEN1, SEN3, . . . ,
SENm-1 to the ADC 460 via the multiplexer 412.
[0149] The fifth switch SW5 may sequentially connect the
even-numbered sensing lines SEN2, SEN4, . . . , SENm to the ADC 460
via the multiplexer 412.
[0150] In the exemplary embodiment of the invention, as shown in
FIG. 6, an auxiliary capacitor Ct, which is disposed between the
first switch SW1' and the multiplexer 412 and connected between
each of the first switches SW1' and a ground power supply may be
additionally provided. The auxiliary capacitor Ct may store a
voltage supplied from the first switch SW1'.
[0151] FIG. 7 is a waveform diagram illustrating an operation
process of the first compensator shown in FIG. 5.
[0152] Referring to FIG. 7, the reference power supply Vref may be
set to the first voltage V1 during a first period T11. The second
switch SW2' may be turned on during the first period T1. The first
voltage V1 of the reference power supply Vref may be supplied to
the odd-numbered sensing lines SEN1, SEN3, . . . , SENm-1 when the
second switch SW2' is turned on. The first voltage V1 may be stored
in the capacitors C1, C3, . . . , Cm-1 equivalently positioned in
the odd-numbered sensing lines SEN1, SEN3, . . . , SENm-1,
respectively.
[0153] After the first voltage V1 is stored in the capacitors C1,
C3, . . . , Cm-1 disposed in the odd sensing lines SEN1, SEN3, . .
. , SENm-1, the first switch SW1' and the fourth switch SW4' may be
turned on.
[0154] Each of the odd-numbered sensing lines SEN1, SEN3, . . . ,
SENm-1 may be connected to the multiplexer 412 when the first
switch SW1' is turned on. The ADC 460 may be connected to the
multiplexer 412 when the fourth switch SW4' is turned on.
[0155] The multiplexer 412 may sequentially connect the
odd-numbered sensing lines SEN1, SEN3, . . . , SENm-1 to the fourth
switch SW4'. In an exemplary embodiment, the multiplexer 412 may
sequentially connect the fourth switch SW4' to the first sensing
line SEN1, the third sensing line SEN3, . . . , and the (m-1)th
sensing line SENm-1, for example. The voltages stored in the
capacitors C1, C3, . . . , Cm-1 of the odd-numbered sensing lines
SEN1, SEN3, . . . , SENm-1 may be supplied to the ADC 460. The ADC
460 may store the voltages stored in the capacitors C1, C3, . . . ,
Cm-1 in the second compensator 470 as odd-numbered channel data in
a digital form.
[0156] In the second period T12, the reference power supply Vref
may be set to the second voltage V2 which is different from the
first voltage V1. In an exemplary embodiment, the second voltage V2
may be set to the voltage lower than the first voltage V1, for
example. In the second period T12, the third switch SW3' may be
turned on. The second voltage V2 of the reference power supply Vref
may be supplied to the even-numbered sensing lines SEN2, SEN4, . .
. , SENm when the third switch SW3' is turned on. The second
voltage V2 may be stored in the capacitors C2, C4, . . . , Cm
equivalently positioned in the even-numbered sensing lines SEN2,
SEN4, . . . , SENm, respectively.
[0157] After the second voltages V2 are stored in the capacitors
C2, C4, . . . , Cm disposed in the even-numbered sensing lines
SEN2, SEN4, . . . , SENm, the first switch SW1' and the fifth
switch SW5 may be turned on.
[0158] Each of the even-numbered sensing lines SEN2, SEN4, . . . ,
SENm may be connected to the multiplexer 412 when the first switch
SW1' is turned on. The ADC 460 may be connected to the multiplexer
412 when the fifth switch SW5 is turned on.
[0159] The multiplexer 412 may sequentially connect the
even-numbered sensing lines SEN2, SEN4, . . . , SENm to the fifth
switch SW5. In an exemplary embodiment, the multiplexer 412 may
sequentially connect the fifth switch SW5 to the second sensing
line SEN2, the fourth sensing line SEN4, . . . , and the mth
sensing line SENm. The voltages stored in the capacitors C2, C4, .
. . , Cm of the even-numbered sensing lines SEN2, SEN4, . . . ,
SENm may be supplied to the ADC 460, for example. The ADC 460 may
store the voltages stored in the capacitors C2, C4, . . . , Cm in
the second compensator 470 as even-numbered channel data in a
digital form.
[0160] According to an exemplary embodiment, channel data of each
of the sensing lines SEN1 to SENm may be stored in the second
compensator 470 according to the first period T11 and a second
period T12 described above.
[0161] The first switch SW1', the fourth switch SW4', and the fifth
switch SW5 may be turned on during a third period T13. The sensing
lines SEN1 to SENm may be connected to the multiplexer 412 when the
first switch SW1' is turned on. The ADC 460 may be connected to the
multiplexer 412 when the fourth switch SW4' and the fifth switch
SW5 are turned on.
[0162] During the third period T13, the multiplexer 412 may
electrically connect adjacent sensing lines. In an exemplary
embodiment, during the third period T13, the multiplexer 412 may
electrically connect a predetermined sensing line to a sensing
line, which is disposed on the left side on the basis of the
predetermined sensing line, for example.
[0163] In an exemplary embodiment, the multiplexer 412 may connect
the fourth switch SW4' to the first sensing line SEN1, the third
sensing line SEN3, . . . , the (m-1)th sensing line SENm-1 during
the third period T13, for example. The multiplexer 412 may connect
the fifth switch SW5 to the second sensing line SEN2, the fourth
sensing line SEN4, . . . , and the mth sensing line SENm during the
third period T13.
[0164] When the first sensing line SEN1 is connected to the fourth
switch SW4' and the second sensing line SEN2 is connected to the
fifth switch SW5, the voltages stored in the first capacitor C1 and
the second capacitor C2 may be charge-shared. In such a case, the
predetermined charge share voltage may be applied to the first
sensing line SEN1 and the second sensing line SEN2.
[0165] The charge sharing voltage of the first sensing line SEN1
and the second sensing line SEN2 may be supplied to the ADC 460.
The ADC 460 may store the charge sharing voltage in the second
compensator 470 as the first charge data.
[0166] As described above, the multiplexer 412 may sequentially
connect the fourth switch SW4' to the first sensing line SEN1, the
third sensing line SEN3, . . . , the (m-1)th sensing line SENm-1
and sequentially connect the fifth switch SW5 to the second sensing
line SEN2, the fourth sensing line SEN4, . . . , the mth sensing
line SENm during the third period T13. Correspondingly, the ADC 460
may generate and store third charge data (corresponding to the
third sensing line SEN3 and a fourth sensing line SEN4), fifth
charge data (corresponding to a fifth sensing line SEN5 and a sixth
sensing line SEN6), . . . , and the like in the second compensator
470 during the third period T13.
[0167] In a fourth period T14, the reference power supply Vref may
be set to the first voltage V1, and the second switch SW2' may be
turned on. The first voltage V1 of the reference power supply Vref
may be supplied to the odd-numbered sensing lines SEN1, SEN3, . . .
, and SENm-1 when the second switch SW2' is turned on. The first
voltage V1 may be stored in the capacitors C1, C3, . . . , Cm-1
disposed in the odd-numbered sensing lines SEN1, SEN3, SENm-1,
respectively.
[0168] In a fifth period T15, the reference power supply Vref may
be set to the second voltage V2, and the third switch SW3' may be
turned on. The second voltage V2 of the reference power supply Vref
may be supplied to the even-numbered sensing lines SEN2, SEN4, . .
. , SENm when the third switch SW3' is turned on. The second
voltage V2 may be stored in the capacitors C2, C4, . . . , Cm
disposed in the even-numbered sensing lines SEN2, SEN4, . . . ,
SENm, respectively.
[0169] In a sixth period T16, the first switch SW1', the fourth
switch SW4', and the fifth switch SW5 may be turned on. The sensing
lines SEN1 to SENm may be connected to the multiplexer 412 when the
first switch SW1' is turned on. The ADC 460 may be connected to the
multiplexer 412 when the fourth switch SW4' and the fifth switch
SW5 are turned on.
[0170] During a sixth period T16, the multiplexer 412 may
electrically connect the adjacent sensing lines. In an exemplary
embodiment, during the third period T13, the multiplexer 412 may
electrically connect a predetermined sensing line with a sensing
line positioned on the right side on the basis of the predetermined
sensing line, for example.
[0171] In an exemplary embodiment, the multiplexer 412 may
sequentially connect the fourth switch SW4' to the third sensing
line SEN3, the fifth sensing line SEN5, . . . , to the (m-1)th
sensing line SENm-1 during the sixth period T16, for example. The
multiplexer 412 may sequentially connect the fifth switch SW5 to
the second sensing line SEN2, the fourth sensing line SEN4, . . . ,
an (m-2)th sensing line SENm-2 during the sixth period T16.
[0172] When the third sensing line SEN3 is connected to the fourth
switch SW4' and the second sensing line SEN2 is connected to the
fifth switch SW5, the voltages stored in the second capacitor C2
and the third capacitor C3 may be charge-shared. In such a case, a
predetermined charge share voltage may be applied to the second
sensing line SEN2 and the third sensing line SEN3.
[0173] The charge share voltage of the second sensing line SEN2 and
the third sensing line SEN3 may be supplied to the ADC 460. The ADC
460 may store the charge share voltage in the second compensator
470 as the second charge data.
[0174] As described above, the multiplexer 412 may sequentially
connect the fourth switch SW4' to the third sensing line SEN3, the
fifth sensing line SEN5, . . . , the (m-1)th sensing line SENm-1
during the sixth period T16, and connect the fifth switch SW5 to
the second sensing line SEN2, the fourth sensing line SEN4, . . . ,
the (m-2)th sensing line SENm-2. Correspondingly, the ADC 460 may
generate and store second charge data (corresponding to the second
sensing line SEN2 and the third sensing line SEN3), fourth charge
data (corresponding to the fourth sensing line SEN4 and the fifth
sensing line SEN5), and the like in the second compensator 470
during the sixth period T16.
[0175] The channel data and the charge data of each of the sensing
lines SEN1 to SENm may be sensed through the first period T11 to
the sixth period T16. The second compensator 470 or the timing
controller 600 may obtain ratios of capacitors of each channel by
the channel data and the charge data. In an exemplary embodiment,
the second compensator 470 or the timing controller 600 may
determine a ratio of the first capacitor C1 to each of the second
to mth capacitors C2 to Cm (e.g., C1/C2, C1/C3 . . . C1/Cm), for
example. Information on a ratio of the capacitors obtained in the
second compensator 470 or the timing controller 600, that is, the
deviation information of the sensing lines SEN1 to SENm may be
stored in the second compensator 470 as the first sensing data.
[0176] The timing controller 600 may show the channel deviation
information by the first sensing data and correct the second
sensing data by reflecting the channel deviation information. The
second data Data2 may be generated corresponding to the
characteristic information of each of the pixels 510 (refer to FIG.
1) regardless of the channel deviation, thereby improving the image
quality.
[0177] FIG. 8 is a diagram illustrating another embodiment of the
first compensator shown in FIG. 1. The same reference numerals are
assigned to the same constituent elements as those in FIG. 5, and a
detailed description thereof will be omitted.
[0178] Referring to FIG. 8, the first compensator 400 according to
another embodiment of the invention may include a first switch unit
422', the multiplexer 412, and a second switch 430.
[0179] The first switch unit 422' may connect the odd-numbered
sensing lines SEN1, SEN3, . . . , SENm-1 to a first reference power
supply Vref1 or the multiplexer 412. In addition, the first switch
unit 422' may connect the even-numbered sensing lines SEN2, SEN4, .
. . , SENm to a second reference power supply Vref2 or the
multiplexer 412. To this end, the first switch unit 422' may
include the first switch SW1', the second switch SW2', and the
third switch SW3'.
[0180] The first switch SW1' may be positioned between each of the
sensing lines SEN1 to SENm and the multiplexer 412. The sensing
lines SEN1 to SENm may be connected to the multiplexer 412 when the
first switch SW1' is turned on.
[0181] The second switch SW2' may be disposed between each of the
odd-numbered sensing lines SEN1, SEN3, . . . , SENm-1 and the first
reference power supply Vref1. The first reference power supply
Vref1 may be set to the first voltage V1. The first voltage V1 of
the first reference power supply Vref1 may be supplied to the
odd-numbered sensing lines SEN1, SEN3, . . . , SENm-1 when the
second switch SW2' is turned on
[0182] The third switch SW3' may be disposed between each of the
even-numbered sensing lines SEN2, SEN4, . . . , SENm and the second
reference power supply Vref2. The second reference power supply
Vref2 may be set to the second voltage V2. The second voltage V2 of
the second reference power supply Vref2 may be supplied to the
even-numbered sensing lines SEN2, SEN4, . . . , SENm when the third
switch SW3' is turned on
[0183] According to an exemplary embodiment, as shown in FIG. 9, an
auxiliary capacitor Ct, which is disposed between the first switch
SW1' and the multiplexer 412 and connected to each of the first
switches SW1', may be additionally provided. The auxiliary
capacitor Ct may store a voltage supplied from the first switch
SW1'.
[0184] FIG. 10 is a waveform diagram illustrating an operation
process of the first compensator shown in FIG. 8.
[0185] Referring to FIG. 10, the second switch SW2' and the third
switch SW3' may be turned on during a first period T21.
[0186] The first voltage V1 of the first reference power supply
Vref1 may be supplied to the odd-numbered sensing lines SEN1, SEN3,
. . . , SENm-1 when the second switch SW2' is turned on. The first
voltage V1 may be stored in the capacitors C1, C3, . . . , Cm-1
equivalently positioned in the odd-numbered sensing lines SEN1,
SEN3, . . . , SENm-1, respectively.
[0187] The second voltage V2 of the second reference power supply
Vref2 may be supplied to the even-numbered sensing lines SEN2,
SEN4, . . . , SENm when the third switch SW3' is turned on. The
second voltage V2 may be stored in the capacitors C2, C4, . . . ,
Cm equivalently positioned in each of the even-numbered sensing
lines SEN2, SEN4, . . . , SENm, respectively.
[0188] The first switch SW1' and the fourth switch SW4' may be
turned on during the first period T21. Each of the sensing lines
SEN1 to SENm may be connected to the multiplexer 412 when the first
switch SW1' is turned on. The ADC 460 may be connected to the
multiplexer 412 when the fourth switch SW4' is turned on.
[0189] The multiplexer 412 may sequentially connect the
odd-numbered sensing lines SEN1, SEN3, . . . , SENm-1 to the fourth
switch SW4'. In an exemplary embodiment, the multiplexer 412 may
sequentially connect the fourth switch SW4' to the first sensing
line SEN1, the third sensing line SEN3, . . . , the (m-1)th sensing
line SENm-1, for example. The voltages stored in the capacitors C1,
C3, . . . , Cm-1 of the odd-numbered sensing lines SEN1, SEN3, . .
. , SENm-1, respectively, may be supplied to the ADC 460. The ADC
460 may store the voltages stored in the capacitors C1, C3, . . . ,
Cm-1 in the second compensator 470 as the odd-numbered channel data
in a digital form.
[0190] In a second period T22, the first switch SW1' and the fifth
switch SW5 may be turned on.
[0191] Each of the sensing lines SEN1 to SENm may be connected to
the multiplexer 412 when the first switch SW1' is turned on. The
ADC 460 may be connected to the multiplexer 412 when the fifth
switch SW5 is turned on.
[0192] The multiplexer 412 may sequentially connect the
even-numbered sensing lines SEN2, SEN4, . . . , SENm to the fifth
switch SW5. In an exemplary embodiment, the multiplexer 412 may
sequentially connect the fifth switch SW5 to the second sensing
line SEN2, the fourth sensing line SEN4, . . . , the mth sensing
line SENm, for example. The voltages stored in the capacitors C2,
C4, . . . , Cm of the even-numbered sensing lines SEN2, SEN4, . . .
, SENm, respectively, may be supplied to the ADC 460, for example.
The ADC 460 may store the voltages stored in the capacitors C2, C4,
. . . , Cm in the second compensator 470 as the even-numbered
channel data in a digital form.
[0193] According to an exemplary embodiment, the channel data of
each of the sensing lines SEN1 to SENm may be stored in the second
compensator 470 by the first period T21 and the second period T22
described above.
[0194] Subsequently, the first switch SW1', the fourth switch SW4'
and the fifth switch SW5 may be turned on during a third period
T23. The sensing lines SEN1 to SENm may be connected to the
multiplexer 412 when the first switch SW1' is turned on. The ADC
460 may be connected to the multiplexer 412 when the fourth switch
SW4' and the fifth switch SW5 are turned on.
[0195] During the third period T23, the multiplexer 412 may
electrically connect the adjacent sensing lines. In an exemplary
embodiment, during the third period T23, the multiplexer 412 may
electrically connect the predetermined sensing line to the sensing
line, which is disposed on the left side on the basis of the
predetermined sensing line, for example.
[0196] In an exemplary embodiment, the multiplexer 412 may connect
the fourth switch SW4' to the first sensing line SEN1, the third
sensing line SEN3, . . . , the (m-1)th sensing line SENm-1 during
the third period T23, for example. In addition, the multiplexer 412
may sequentially connect the fifth switch SW5 to the second sensing
line SEN2, the fourth sensing line SEN4, . . . , the mth sensing
line SENm during the third period T23.
[0197] When the first sensing line SEN1 is connected to the fourth
switch SW4' and the second sensing line SEN2 is connected to the
fifth switch SW5, the voltages stored in the first capacitor C1 and
the second capacitor C2 may be charge-shared. In such a case, a
predetermined charge share voltage may be applied to the first
sensing line SEN1 and the second sensing line SEN2.
[0198] The charge share voltages of the first sensing line SEN1 and
the second sensing line SEN2 may be supplied to the ADC 460. The
ADC 460 may output the charge share voltage in the second
compensator 470 as the first charge data.
[0199] Thus, the multiplexer 412 may sequentially contact the
fourth switch SW4' to the first sensing line SEN1, the third
sensing line SEN3, . . . , the (m-1)th sensing line SENm-1 and
sequentially connect the fifth switch SW5 to the second sensing
line SEN2, the fourth sensing line SEN4, . . . , the mth sensing
line SENm during the third period T23. Correspondingly, the ADC 460
may generate and store third charge data (corresponding to the
third sensing line SEN3 and the fourth sensing line SEN4), fifth
charge data (corresponding to the fifth sensing line SEN5 and the
sixth sensing line SEN6), and the like in the second compensator
470 during the third period T23.
[0200] In a fourth period T24, the second switch SW2' and the third
switch SW3' may be turned on. The first voltage V1 of the first
reference power supply Vref1 may be supplied to the odd-numbered
sensing lines SEN1, SEN3, . . . , SENm-1 when the second switch
SW2' is turned on. The first voltage V1 may be stored in the
capacitors C1, C3, . . . , Cm-1 disposed in the odd-numbered
sensing lines SEN1, SEN3, . . . , SENm-1, respectively.
[0201] The second voltage V2 of the second reference power supply
Vref2 may be supplied to the even-numbered sensing lines SEN2,
SEN4, . . . , SENm when the third switch SW3' is turned on. The
second voltage V2 may be stored in the capacitors C2, C4, . . . ,
Cm disposed in the even-numbered sensing lines SEN2, SEN4, . . . ,
SENm, respectively.
[0202] In a fifth period T25, the first switch SW1', the fourth
switch SW4', and the fifth switch SW5 may be turned on. The sensing
lines SEN1 to SENm may be connected to the multiplexer 412 when the
first switch SW1' is turned on. The ADC 460 may be connected to the
multiplexer 412 when the fourth switch SW4' and the fifth switch
SW5 are turned on.
[0203] During the fifth period T25, the multiplexer 412 may
electrically connect the adjacent sensing lines. In an exemplary
embodiment, during the fifth period T25, the multiplexer 412 may
electrically connect the predetermined sensing line and the sensing
line disposed on the right side on the basis of the predetermined
sensing line, for example.
[0204] In an exemplary embodiment, the multiplexer 412 may
sequentially connect the fourth switch SW4' to the third sensing
line SEN3, the fifth sensing line SEN5, . . . , the (m-1)th sensing
line SENm-1 during the fifth period T25, for example. The
multiplexer 412 may connect the fifth switch SW5 to the second
sensing line SEN2, the fourth sensing line SEN4, . . . , the
(m-2)th sensing line SENm-2 during the fifth period T25.
[0205] When the third sensing line SEN3 is connected to the fourth
switch SW4' and the second sensing line SEN2 is connected to the
fifth switch SW5, the voltages stored in the second capacitor C2
and the third capacitor C3 may be charge-shared. In such a case, a
predetermined charge share voltage may be applied to the second
sensing line SEN2 and the third sensing line SEN3.
[0206] The charge share voltages of the second sensing line SEN2
and the third sensing line SEN3 may be supplied to the ADC 460. The
ADC 460 may store the charge share voltage in the second
compensator 470 as the second charge data.
[0207] As described above, the multiplexer 412 may sequentially
connect the fourth switch SW4' to the third sensing line SEN3, the
fifth sensing line SEN5, . . . , the (m-1)th sensing line SENm-1
and sequentially connect the fifth switch SW5 to the second sensing
line SEN2, the fourth sensing line SEN4, . . . , the (m-2)th
sensing line SENm-2 during the fifth period T25. Correspondingly,
the ADC 460 may generate the second charge data (corresponding to
the second sensing line SEN2 and the third sensing line SEN3), the
fourth charge data (corresponding to the fourth sensing line SEN4
and the fifth sensing line SEN5), and the like in the second
compensator 470 during the fifth period T25.
[0208] The channel data and the charge data of the sensing lines
SEN1 to SENm may be sensed through the first period T21 to the
fifth period T25 as described above. The second compensator 470 or
the timing controller 600 may obtain the ratio of the capacitors of
each channel by the channel data and the charge data. In an
exemplary embodiment, the second compensator 470 or the timing
controller 600 may obtain the ratios of the first capacitors C1 and
the second to mth capacitors C2 to Cm, for example. The information
on the ratios of the capacitors obtained in the second compensator
470 or the timing controller 600, that is, the deviation
information of the sensing lines SEN1 to SENm may be stored in the
second compensator 470 as the first sensing data.
[0209] The timing controller 600 may show the channel deviation
information by the first sensing data and correct the second
sensing data by reflecting the channel deviation information. The
second data Data2 may be generated corresponding to the
characteristic information of each of the pixels 510 (refer to FIG.
1) regardless of the channel deviation, thereby improving the image
quality.
[0210] FIG. 11 is a diagram illustrating another exemplary
embodiment of the first compensator shown in FIG. 1.
[0211] Referring to FIG. 11, the first compensator 400 according to
another embodiment of the invention may include a switch unit 424
and a multiplexer 414.
[0212] The switch unit 424 may connect the sensing lines SEN1,
SEN3, . . . , SENm to the multiplexer 414, the first reference
power supply Vref1 or the second reference power supply Vref2. The
switch unit 424 may include the first switches SW1', the second
switches SW2', the third switches SW3', fourth switches SW4'' and
fifth switches SW5''.
[0213] The first switches SW1' may be disposed between the sensing
lines SEN1 to SENm and the multiplexer 414. The sensing lines SEN1
to SENm may be connected to the multiplexer 414 when the first
switches SW1' are turned on.
[0214] The second switches SW2' may be disposed between the
odd-numbered sensing lines SEN1, SEN3, . . . , SENm-1 and the first
reference power supplies Vref1. The first reference power supplies
Vref1 may be set to the first voltages V1. The first voltages V1 of
the first reference power supplies Vref1 may be supplied to the
odd-numbered sensing lines SEN1, SEN3, . . . , SENm-1 when the
second switches SW2' are turned on
[0215] The third switches SW3' may be disposed between the
even-numbered sensing lines SEN2, SEN4, . . . , SENm and the second
reference power supplies Vref2. The second reference power supplies
Vref2 may be set to the second voltages V2. The second voltages V2
of the second reference power supplies Vref2 may be supplied to the
even-numbered sensing lines SEN2, SEN4, . . . , SENm when the third
switches SW3' are turned on.
[0216] The fourth switches SW4'' may be disposed between an ith
sensing line SENi (where i is 1, 3, 5, 7, . . . ) and an (i+1)th
sensing line SENi+1. The ith sensing line SENi and the (i+1)th
sensing line SENi+1 may be electrically connected when the fourth
switches SW4'' are turned on.
[0217] The fifth switches SW5'' may be disposed between the (i+1)th
sensing line SENi+1 and an (i+2)th sensing line SENi+2. The (i+1)th
sensing line SENi+1 and the (i+2)th sensing line SENi+2 may be
electrically connected when the fifth switches SW5'' are turned
on.
[0218] The multiplexer 414 may control connection of the sensing
lines SEN1 to SENm and the ADC 460. In an exemplary embodiment, the
multiplexer 414 may sequentially connect the sensing lines SEN1 to
SENm to the ADC 460, for example.
[0219] In the exemplary embodiment of the invention, as shown in
FIG. 12, the auxiliary capacitor Ct, which is disposed between the
first switch SW1' and the multiplexer 414 and connected to each of
the first switches SW1', may be additionally provided. The
auxiliary capacitor Ct may store a voltage supplied from the first
switch SW1'.
[0220] FIG. 13 is a diagram illustrating an operation process of
the first compensator shown in FIG. 11.
[0221] Referring to FIG. 13, the second switch SW2' and the third
switch SW3' may be turned on during a first period T31.
[0222] The first voltage V1 of the first reference power supply
Vref1 may be supplied to the odd-numbered sensing lines SEN1, SEN3,
. . . , SENm-1 when the second switch SW2' is turned on. The first
voltage V1 may be stored in the capacitors C1, C3, . . . , Cm-1
equivalently positioned in the odd-numbered sensing lines SEN1,
SEN3, . . . , SENm-1, respectively.
[0223] The second voltage V2 of the second reference power supply
Vref2 may be supplied to the even-numbered sensing lines SEN2,
SEN4, . . . , SENm when the third switch SW3' is turned on. The
second voltage V2 may be stored in the capacitors C2, C4, . . . ,
Cm equivalently positioned in the even-numbered sensing lines SEN2,
SEN4, . . . , SENm, respectively.
[0224] In a second period T32, the first switch SW1' may be turned
on. The sensing lines SEN1 to SENm may be connected to the
multiplexer 414 when the first switch SW1' is turned on.
[0225] The multiplexer 414 may sequentially connect the sensing
lines SEN1 to SENm to the ADC 460. The voltages stored in the
capacitors C1 to Cm of the sensing lines SEN1 to SENm,
respectively, may be supplied to the ADC 460. The ADC 460 may store
the voltages stored in the capacitors C1 to Cm in the second
compensator 470 as the channel data in a digital form.
[0226] In a third period T33, the first switch SW1' and the fourth
switch SW4'' may be turned on. The ith sensing line SENi and the
(i+1)th sensing line SENi+1 may be electrically connected when the
fourth switch SW4'' is turned on. In such a case, a predetermined
charge share voltage may be applied to the ith sensing line SENi
and the (i+1)th sensing line SENi+1.
[0227] The multiplexer 414 may be sequentially connected to the ith
sensing line SENi or the (i+1)th sensing line SENi+1 during the
third period T33. Then, the ADC 460 may generate the first charge
data (corresponding to the first sensing line SEN1 and the second
sensing line SEN2), the third charge data (corresponding to the
third sensing line SEN3 and the fourth sensing line SEN4), the
fifth charge data (corresponding to the fifth sensing line SEN5 and
the sixth sensing line SEN6), and the like, and the generated
charge data may be stored in the second compensator 470.
[0228] During a fourth period T34, the second switch SW2' and the
third switch SW3' may be turned on. The first voltage V1 of the
first reference power supply Vref1 may be supplied to the
odd-numbered sensing lines SEN1, SEN3, . . . , SENm-1 when the
second switch SW2' is turned on. The first voltage V1 may be stored
in the capacitors C1, C3, . . . , Cm-1 disposed in the odd-numbered
sensing lines SEN1, SEN3, . . . , SENm-1, respectively.
[0229] The second voltage V2 of the second reference power supply
Vref2 may be supplied to the even-numbered sensing lines SEN2,
SEN4, . . . , SENm when the third switch SW3' is turned on. The
second voltage V2 may be stored in the capacitors C2, C4, . . . ,
Cm disposed in the even-numbered sensing lines SEN2, SEN4, . . . ,
SENm, respectively.
[0230] In a fifth period T35, the first switch SW1' and the fifth
switch SW5'' may be turned on. The (i+1)th sensing line SENi+1 and
the (i+2)th sensing line SENi+1 may be electrically connected when
the fifth switch SW5'' is turned on. In such a case, a
predetermined charge share voltage may be applied to the (i+1)th
sensing line SENi+1 and the (i+2)th sensing line SENi+2.
[0231] The multiplexer 414 may be sequentially connected to the
(i+1)th sensing line SENi+1 or the (i+2)th sensing line SENi+2
during the fifth period T35. The ADC 460 may generate the second
charge data (corresponding to the second sensing line SEN2 and the
third sensing line SEN3), the fourth charge data (corresponding to
the fourth sensing line SEN4 and the fifth sensing line SEN5) and
the like, and the generated charge data may be supplied to the
second compensator.
[0232] The channel data and the charge data of the sensing lines
SEN1 to SENm may be sensed through the first period T31 to the
fifth period T35 as described above. The second compensator 470 or
the timing controller 600 may obtain the ratio of the capacitors of
each channel by the channel data and the charge data. In an
exemplary embodiment, the second compensator 470 or the timing
controller 600 may obtain the ratio of the second capacitor C2 to
the mth capacitor Cm based on the first capacitor C1, for example.
The information on the ratio of the capacitors obtained in the
second compensator 470 or the timing controller 600, that is, the
deviation information of the sensing lines SEN1 to SENm may be
stored in the second compensator 470 as first sensing data.
[0233] The timing controller 600 may show the channel deviation
information by the first sensing data and correct the second
sensing data by reflecting the channel deviation information. The
second data Data2 may be generated corresponding to the
characteristic information of each of the pixels 510 (refer to FIG.
1) regardless of the channel deviation, thereby improving the image
quality.
[0234] FIG. 14 is a diagram illustrating a driving method for
sensing channel deviation information according to an exemplary
embodiment. FIG. 14 discloses a principle of a driving method of
the invention by two sensing lines.
[0235] Referring to FIG. 14, the first voltage V1 may be supplied
to the first sensing line (S1000). A voltage corresponding to the
first voltage V1 may be applied to the first capacitor equivalent
to the first sensing line. The ADC 460 may generate the first
channel data in a digital form by the voltage stored in the first
capacitor (S1002).
[0236] After the first channel data is generated, the second
voltage V2 different from the first voltage V1 may be supplied to
the second sensing line (S1004). A voltage corresponding to the
second voltage V2 may be stored in the second capacitor equivalent
to the second sensing line. The ADC 460 may generate the second
channel data in a digital form by the voltage stored in the second
capacitor (S1006).
[0237] FIG. 14 shows that the second voltage is supplied to the
second sensing line after the first channel data is generated.
However, the invention is not limited thereto. In an exemplary
embodiment, the first channel data may be generated after the
second voltage V2 is supplied to the second sensing, for
example.
[0238] After the second channel data is generated in operation
S1006, the first sensing line and the second sensing line may be
electrically connected. The voltage stored in the first capacitor
and the voltage stored in the second capacitor may be
charge-shared, and a predetermined charge share voltage may be
applied to the first sensing line and the second sensing line
(S1008).
[0239] Subsequently, the ADC 460 may generate charge data in a
digital form by the charge share voltage (S1010). The timing
controller 600 or the second compensator 470 may determine or
obtain the ratio of the first capacitor to the second capacitor by
the first channel data, the second channel data, and the charge
data (S1012). The deviation information of the first sensing line
and the second sensing line may be used as the ratio of the first
capacitor to the second capacitor.
[0240] According to a display device and a driving method thereof
according to the exemplary embodiment of the invention, first
sensing data corresponding to channel deviation information and
second sensing data corresponding to characteristic information of
pixels may be sensed. The channel deviation may be removed from the
second sensing data by the first sensing data, and thus the
characteristic deviation of the pixels may be accurately
compensated.
[0241] While the invention has been particularly shown and
described with reference to exemplary embodiments thereof, it is to
be understood that the invention is not limited to the disclosed
exemplary embodiments. It will be apparent to those skilled in the
art that various modifications may be made without departing from
the scope of the invention.
[0242] The scope of the invention is defined by the following
claims, and is not limited to the description of the specification,
and all variations and modifications falling within the scope of
the claims are included in the scope of the invention.
* * * * *